mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

Dependents:   Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more

targets/TARGET_ARM_SSG/TARGET_CM3DS_MPS2/trng_api.c@189:f392fc9709a3, 2019-02-20 (annotated)

Committer:
AnnaBridge
Date:
Wed Feb 20 22:31:08 2019 +0000
Revision:
189:f392fc9709a3
Parent:
186:707f6e361f3e 
mbed library release version 165

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Anna Bridge 186:707f6e361f3e 1 /*
Anna Bridge 186:707f6e361f3e 2 * Copyright (c) 2017-2018 ARM Limited
Anna Bridge 186:707f6e361f3e 3 *
Anna Bridge 186:707f6e361f3e 4 * Licensed under the Apache License, Version 2.0 (the "License");
Anna Bridge 186:707f6e361f3e 5 * you may not use this file except in compliance with the License.
Anna Bridge 186:707f6e361f3e 6 * You may obtain a copy of the License at
Anna Bridge 186:707f6e361f3e 7 *
Anna Bridge 186:707f6e361f3e 8 * http://www.apache.org/licenses/LICENSE-2.0
Anna Bridge 186:707f6e361f3e 9 *
Anna Bridge 186:707f6e361f3e 10 * Unless required by applicable law or agreed to in writing, software
Anna Bridge 186:707f6e361f3e 11 * distributed under the License is distributed on an "AS IS" BASIS,
Anna Bridge 186:707f6e361f3e 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
Anna Bridge 186:707f6e361f3e 13 * See the License for the specific language governing permissions and
Anna Bridge 186:707f6e361f3e 14 * limitations under the License.
Anna Bridge 186:707f6e361f3e 15 */
Anna Bridge 186:707f6e361f3e 16
Anna Bridge 186:707f6e361f3e 17 #include "trng_api.h"
Anna Bridge 186:707f6e361f3e 18 #include "tztrng.h"
Anna Bridge 186:707f6e361f3e 19
Anna Bridge 186:707f6e361f3e 20 #define BITS_PER_BYTE 8
Anna Bridge 186:707f6e361f3e 21
Anna Bridge 186:707f6e361f3e 22 void trng_init(trng_t *obj)
Anna Bridge 186:707f6e361f3e 23 {
Anna Bridge 186:707f6e361f3e 24 /* Initialization is made in the driver */
Anna Bridge 186:707f6e361f3e 25 (void)obj;
Anna Bridge 186:707f6e361f3e 26 }
Anna Bridge 186:707f6e361f3e 27
Anna Bridge 186:707f6e361f3e 28 void trng_free(trng_t *obj)
Anna Bridge 186:707f6e361f3e 29 {
Anna Bridge 186:707f6e361f3e 30 /* The current implementation only contains a dummy version of TRNG */
Anna Bridge 186:707f6e361f3e 31 (void)obj;
Anna Bridge 186:707f6e361f3e 32 }
Anna Bridge 186:707f6e361f3e 33
Anna Bridge 186:707f6e361f3e 34 int trng_get_bytes(trng_t *obj, uint8_t *output, size_t length, size_t *output_length)
Anna Bridge 186:707f6e361f3e 35 {
Anna Bridge 186:707f6e361f3e 36 uint32_t retval;
Anna Bridge 186:707f6e361f3e 37
Anna Bridge 186:707f6e361f3e 38 (void)obj;
Anna Bridge 186:707f6e361f3e 39 /* The TRNG driver expects a number of bits. */
Anna Bridge 186:707f6e361f3e 40 retval = CC_TrngGetSource(TRNG_BASE, output, output_length,
Anna Bridge 186:707f6e361f3e 41 length * BITS_PER_BYTE);
Anna Bridge 186:707f6e361f3e 42
Anna Bridge 186:707f6e361f3e 43 if (retval != 0) {
Anna Bridge 186:707f6e361f3e 44 return -1;
Anna Bridge 186:707f6e361f3e 45 }
Anna Bridge 186:707f6e361f3e 46 return 0;
Anna Bridge 186:707f6e361f3e 47 }